We report in situ characterization of a semiconductor saturable absorber mirror (SESAM) in an operating Yb:KGW mode-locked laser. The technique may be described as a pump-probe experiment in which the intracavity beam acts as a pump beam while the output of the same laser is used as a test beam for the SESAM reflectivity. At zero delay, the probe pulse overlaps in time with the subsequent intracavity pulse. The method is an alternative to standard pump-probe measurements in situations where the intracavity parameters such as energy fluence onto the SESAM, pulse length, and center wavelength cannot be achieved simultaneously with available lasers.
© 2005 Optical Society of America
Gabriela Paunescu, Joachim Hein, Roland Sauerbrey, and Wolfgang Richter, "In situ characterization of semiconductor saturable absorber mirrors in an operating Yb:KGW mode-locked laser," Opt. Lett. 30, 2799-2801 (2005)